Fostoria Baroque, buying sherbet bowls, dessert, ice cream, set of 4, Amethyst, Purple, irradiated, glasses, FREE SHIPPING

4 baroque sherbet bowls, all Vintage Fostoria Amethyst Purple. There are no chips or cracks. They can also be used for ice cream, pudding, etc. They are all the same size and design.

The cups are approximately 5.5 inches tall, approximately 3.25 inches across the opening, and 2.75 inches across the base.


Purple/Amethyst Glass and the Irradiation Process:

The beautiful purple color of buying this glass is caused by the presence of manganese, which was used in early glass production as a de-colorizer to turn the glass clear. Manganese is one of the oldest glass additives, and purple manganese glass was used since early Egyptian history. Around 1915 most glass companies stopped using manganese, substituting selenium as the clearing agent. Glass that contains manganese will turn amethyst/purple when exposed to ultraviolet rays of the sun or other sources of UV rays. When the process of the sun is accelerated by using UV light exposure, it is called “irradiation”. It is a permanent process which reproduces the effects of many years of exposure to natural sunlight, but much faster. A glass item manufactured after this era will not turn purple with UV light exposure, so it is a true indicator of the items age.


As a courtesy we *ALWAYS* insure orders with a value of $50.00 or more, at our expense.

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